package principle.facade;

/**
 * @author malguy-wang sir
 * @create ---
 */
public class stereo {//立体声
    //单例模式-饿汉式
    private static stereo instance = new stereo();
    public static stereo getInstance() { return instance; }
    public void on(){ System.out.println("stereo on"); }
    public void off(){ System.out.println("stereo off"); }
    public void down(){ System.out.println("stereo down"); }
}
